21 oz Standard Mouth Flex Cap Bottle

For runners and hikers who need reliable hydration without lugging a full liter, this is our pick for everyday training and shorter efforts. Double-wall vacuum insulation keeps drinks cold for hours in Southern heat, so you're not sipping warm water by mile three. The standard mouth and flex cap make it easy to drink on the move or clip to a pack.

• Double-wall TempShield vacuum insulation keeps drinks cold 24 hours and hot up to 12 — no sweating on the outside
• 21 oz size hits the sweet spot for shorter runs, day hikes, and gym sessions without adding unnecessary weight
• Standard mouth opening works with most water filters and is easy to clean after muddy trail days
• Flex cap with carry loop doubles as a packable handle — clips to a bag or vest when your hands are full
• 18/8 pro-grade stainless steel construction won't hold flavors or odors, and the powder coat finish grips even with sweaty hands